Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip

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dc.contributor.authorPolezhaev, Petr
dc.contributor.authorSlouka, Zdeněk
dc.contributor.authorLindner, Jiří
dc.contributor.authorPřibyl, Michal
dc.date.accessioned2022-03-14T11:00:26Z
dc.date.available2022-03-14T11:00:26Z
dc.date.issued2018
dc.description.abstract-translatedWe adopted a method of electrochemical impedance spectroscopy (EIS) for the characterization of slug flow of two immiscible aqueous phases in a flow channel. The impedance response (both magnitude and phase shift) of the two-phase system is measured as a function of time at selected frequencies. The presence of slugs or a continuous phase at a pair of parallel facing electrodes can be determined under various signal frequencies mainly due to a significant difference in the electrolytic conductivities of both phases. We found that EIS data are sensitive to the total flowrate at low signal frequencies. Further, we suggested an equivalent electric circuit that takes into account all capacitances and resistances emerging between the two sensing electrodes. We determined the values of these elements by fitting a theoretical model to the experimental data. The obtained values of resistances were used to estimate the thicknesses of the wall film of the continuous phase that is present between a slug of the dispersed fluid and a channel wall. The estimates given by the EIS method were successfully verified by microscopic observation and an available hydrodynamic correlation. The developed EIS method represents an original approach to the estimation of wall film thickness applicable to the efficient control of various droplet-based microfluidic devices such as microreactors and microextractors working with aqueous two-phase systems.en
dc.format7 s.cs
dc.format.mimetypeapplication/pdf
dc.identifier.citationPOLEZHAEV, P. SLOUKA, Z. LINDNER, J. PŘIBYL, M. Characterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chip. MICROELECTRONIC ENGINEERING, 2018, roč. 194, č. JUL 5 2018, s. 89-95. ISSN: 0167-9317cs
dc.identifier.document-number433265900016
dc.identifier.doi10.1016/j.mee.2018.03.003
dc.identifier.issn0167-9317
dc.identifier.obd43935123
dc.identifier.uri2-s2.0-85044131761
dc.identifier.urihttp://hdl.handle.net/11025/47163
dc.language.isoenen
dc.project.IDLO1402/CENTEM+cs
dc.publisherElsevieren
dc.relation.ispartofseriesMicroelectronic Engineeringen
dc.rightsPlný text je přístupný v rámci univerzity přihlášeným uživatelům.cs
dc.rights© Elsevieren
dc.rights.accessrestrictedAccessen
dc.subject.translatedimpedance spectroscopyen
dc.subject.translatedaqueous two-phase systemsen
dc.subject.translatedATPSen
dc.subject.translatedmicrofluidicsen
dc.subject.translatedfilm thicknessen
dc.titleCharacterization of slug flow of two aqueous phases by electrochemical impedance spectroscopy in a fluidic chipen
dc.typečlánekcs
dc.typearticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen

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